Ocean Engineering最新文献

英文中文

Application of transfer learning on physics-based models to enhance vessel shaft power predictions

IF 4.6 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2025-02-08 DOI: 10.1016/j.oceaneng.2025.120540

Stamatis Mavroudis , Tiedo Tinga

International shipping must reduce its emissions to meet global targets, with improving energy efficiency being a crucial step in this journey. Predictive models are essential for implementing energy efficiency measures such as weather routing, scheduling of hull cleanings, and just-in-time arrival, which are vital for reducing fuel consumption and emissions.

This paper explores the use of transfer learning to integrate physics-based and data-driven models for predicting vessel shaft power under varying operating conditions. Physics-based models rely on principles of resistance and propulsion, whereas data-driven models employ advanced machine learning techniques utilizing high-frequency operational data. A novel approach is proposed that integrates synthetic data from physics-based simulations with real operational data via transfer learning. This method enhances model accuracy while significantly reducing the amount of data required, and therefore the time until sufficient data is collected to develop a reliable data-driven model.

The proposed method is demonstrated on an ocean-going vessel use case to predict the shaft power demand in varying conditions. The results reveal that the proposed transfer learning approach outperforms regular data-driven methods, both in accuracy and required training time. The approach thus offers a robust solution for predicting vessel performance, demonstrating improved model accuracy and reduced dependency on extensive real-world data for training.

{"title":"Application of transfer learning on physics-based models to enhance vessel shaft power predictions","authors":"Stamatis Mavroudis , Tiedo Tinga","doi":"10.1016/j.oceaneng.2025.120540","DOIUrl":"10.1016/j.oceaneng.2025.120540","url":null,"abstract":"<div><div>International shipping must reduce its emissions to meet global targets, with improving energy efficiency being a crucial step in this journey. Predictive models are essential for implementing energy efficiency measures such as weather routing, scheduling of hull cleanings, and just-in-time arrival, which are vital for reducing fuel consumption and emissions.</div><div>This paper explores the use of transfer learning to integrate physics-based and data-driven models for predicting vessel shaft power under varying operating conditions. Physics-based models rely on principles of resistance and propulsion, whereas data-driven models employ advanced machine learning techniques utilizing high-frequency operational data. A novel approach is proposed that integrates synthetic data from physics-based simulations with real operational data via transfer learning. This method enhances model accuracy while significantly reducing the amount of data required, and therefore the time until sufficient data is collected to develop a reliable data-driven model.</div><div>The proposed method is demonstrated on an ocean-going vessel use case to predict the shaft power demand in varying conditions. The results reveal that the proposed transfer learning approach outperforms regular data-driven methods, both in accuracy and required training time. The approach thus offers a robust solution for predicting vessel performance, demonstrating improved model accuracy and reduced dependency on extensive real-world data for training.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"323 ","pages":"Article 120540"},"PeriodicalIF":4.6,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143351149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamic damage functions for scour protection at monopile foundations: Application of ensemble machine learning models

IF 4.6 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2025-02-08 DOI: 10.1016/j.oceaneng.2025.120590

Mohammad Najafzadeh , Ana Margarida Bento , Sajad Basirian , Tiago Fazeres-Ferradosa

This study addresses the critical issue of scour, which represents a significant safety threat to marine and offshore structures. The use of smaller stone sizes in scour protections has given rise to concerns pertaining to the potential for damage, thereby emphasizing the imperative for the formulation of explicit criteria to define damage. In order to reduce the uncertainty associated with empirical equations, this research proposes the use of Machine Learning (ML) models to enhance the accuracy of the results. The ML models were developed from the analysis of experimental models concerning dynamic scour protections. A total of 160 scour tests from the existing literature were subjected to analysis in order to quantify the damage levels in protected monopile foundations. Five ML algorithms were employed to quantify the damage: Random Forest (RF), Support Vector Machine (SVM), Extreme Gradient Boosting (XGBoost), Adaptive Boosting (AdaBoost), and Categorical Boosting (CatBoost). In the training and testing phases, the XGBoost, CatBoost, and AdaBoost models exhibited superior accuracy in predicting damage, with the RF models exhibiting a worse performance. The results provide substantial evidence of the potential of ML techniques to damage levels at scour protections. Furthermore, the promising performance of visual assessment of scour damage at monopile foundations was observed across different wave number ranges (N = 3000–5000).

{"title":"Dynamic damage functions for scour protection at monopile foundations: Application of ensemble machine learning models","authors":"Mohammad Najafzadeh , Ana Margarida Bento , Sajad Basirian , Tiago Fazeres-Ferradosa","doi":"10.1016/j.oceaneng.2025.120590","DOIUrl":"10.1016/j.oceaneng.2025.120590","url":null,"abstract":"<div><div>This study addresses the critical issue of scour, which represents a significant safety threat to marine and offshore structures. The use of smaller stone sizes in scour protections has given rise to concerns pertaining to the potential for damage, thereby emphasizing the imperative for the formulation of explicit criteria to define damage. In order to reduce the uncertainty associated with empirical equations, this research proposes the use of Machine Learning (ML) models to enhance the accuracy of the results. The ML models were developed from the analysis of experimental models concerning dynamic scour protections. A total of 160 scour tests from the existing literature were subjected to analysis in order to quantify the damage levels in protected monopile foundations. Five ML algorithms were employed to quantify the damage: Random Forest (RF), Support Vector Machine (SVM), Extreme Gradient Boosting (XGBoost), Adaptive Boosting (AdaBoost), and Categorical Boosting (CatBoost). In the training and testing phases, the XGBoost, CatBoost, and AdaBoost models exhibited superior accuracy in predicting damage, with the RF models exhibiting a worse performance. The results provide substantial evidence of the potential of ML techniques to damage levels at scour protections. Furthermore, the promising performance of visual assessment of scour damage at monopile foundations was observed across different wave number ranges (N = 3000–5000).</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"323 ","pages":"Article 120590"},"PeriodicalIF":4.6,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143351152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanism of sailing safety through bridge area based on a coupled hull-propeller-rudder model

IF 4.6 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2025-02-08 DOI: 10.1016/j.oceaneng.2025.120591

Yang Miao , Lei Zhang , Zhiyong Pei , Longming Gu , Bin Liu

The safety of ships sailing through bridge areas has received significant attention, and the ship model without propeller and rudder (H-model) is widely used nowadays. To further elucidate the sailing mechanism in the bridge area, a coupled hull-propeller-rudder model (C-model) is proposed. Specifically, secondary development based on Fluent is undertaken. The governing equations of the ship are embedded using the user-defined function (UDF) module, and a modified multiple reference frame (MRF) model is employed to solve the coupled translational and rotational motions of the propeller. Compared to the motion parameters obtained by the H-model, the additional flow-mediated interactions among the propeller, rudder and pier lead to a smaller yaw angle and a greater lateral displacement. The reasons for these changes are given by analyzing the flow evolution and ship motions. The effects of flow velocity and ship velocity are also given. In front of the pier, the lateral displacement and yaw angle of the ship increase with the flow velocity and decrease with the ship velocity. Behind the pier, the yaw angles increase continuously under conditions of the low flow velocity and high ship velocity, thereby increasing the risk of the stern of the ship sweeping against the pier.

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引用次数: 0

Influence of non-linear wave load models on monopile supported offshore wind turbines for extreme conditions

IF 4.6 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2025-02-08 DOI: 10.1016/j.oceaneng.2025.120510

Gerard V. Ryan , Tianning Tang , Ross A. McAdam , Thomas A.A. Adcock

This paper investigates the influence of non-linear wave loads on the response and design of a monopile supported DTU 10 MW offshore wind turbine during extreme conditions. Morison’s equation with linear wave theory is compared to an experimental based Stokes-type approach and the Rainey force model, both currently considered state-of-the-art. These comparisons show that models incorporating non-linearity significantly impact structural response due to higher harmonic loading coinciding with natural periods. The Stokes-type model method is shown to predict the largest loading and response. These models are compared to the widely used constrained wave approach, showing that significant differences are predicted for steel and geotechnical design checks. This suggests that the industry standard approach may be inappropriate for the design of monopile structures against extreme wave loads.

引用次数: 0

Experimental study on the hydrodynamic performance of an innovative floating dual-chamber oscillating water column

IF 4.6 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2025-02-08 DOI: 10.1016/j.oceaneng.2025.120549

K. Rezanejad , G. Anastas , M. Hashemzadeh , J.F.M. Gadelho , I. López , R. Carballo , C. Guedes Soares

A comprehensive experimental study investigates the efficiency of a newly devised concept of a Floating dual-chamber Oscillating Water Column Wave Energy Converter device. Built upon the previous design of Rezanejad and Guedes Soares (2021), substantial geometrical improvements have been made to enhance its hydrodynamic performance. The study examines the influence of Power Take-Off damping and wave characteristics on its hydrodynamic performance. The experimental results demonstrate a significant increase in hydrodynamic performance across a wide range of sea states compared to the previously designed floating dual-chamber Oscillating Water Column device. Specifically, the new system exhibits an average hydrodynamic performance of 61% in all sea states, representing a 49% improvement over the efficiency of the previous design. Additionally, the research highlights that the device's fore and rear chambers play a dominant role in absorbing wave energy within specific wave period ranges, with their mutual interactions significantly enhancing the overall hydrodynamic performance. This substantial improvement in efficiency underscores the potential of the newly devised device for wave energy conversion applications.

{"title":"Experimental study on the hydrodynamic performance of an innovative floating dual-chamber oscillating water column","authors":"K. Rezanejad , G. Anastas , M. Hashemzadeh , J.F.M. Gadelho , I. López , R. Carballo , C. Guedes Soares","doi":"10.1016/j.oceaneng.2025.120549","DOIUrl":"10.1016/j.oceaneng.2025.120549","url":null,"abstract":"<div><div>A comprehensive experimental study investigates the efficiency of a newly devised concept of a Floating dual-chamber Oscillating Water Column Wave Energy Converter device. Built upon the previous design of Rezanejad and Guedes Soares (2021), substantial geometrical improvements have been made to enhance its hydrodynamic performance. The study examines the influence of Power Take-Off damping and wave characteristics on its hydrodynamic performance. The experimental results demonstrate a significant increase in hydrodynamic performance across a wide range of sea states compared to the previously designed floating dual-chamber Oscillating Water Column device. Specifically, the new system exhibits an average hydrodynamic performance of 61% in all sea states, representing a 49% improvement over the efficiency of the previous design. Additionally, the research highlights that the device's fore and rear chambers play a dominant role in absorbing wave energy within specific wave period ranges, with their mutual interactions significantly enhancing the overall hydrodynamic performance. This substantial improvement in efficiency underscores the potential of the newly devised device for wave energy conversion applications.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"323 ","pages":"Article 120549"},"PeriodicalIF":4.6,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143351151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Extreme design wave parameters optimization of typhoon wave for ocean engineering based on numerical simulation and observation data in the South China Sea

IF 4.6 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2025-02-07 DOI: 10.1016/j.oceaneng.2025.120603

Dong Jiang , Bigui Huang , Qingsheng Miao , Hang Sun , Zhifeng Wang

In this study, 20 typhoons in the South China Sea (SCS) from 2011 to 2022 are selected, based on the Weather Research and Forecasting (WRF) Grid Nudging assimilation technique, the physical parameterization schemes for hindcasting in the SCS during typhoons are Optimization. The best results for typhoon hindcasts are derived using Thompson_KF_YSU combination physical parameterization schemes. Compared to ERA5 reanalysis data, the RMSE decreased by 19.09% overall. Optimization of the physical parameterization scheme in the Simulating WAves Nearshore (SWAN) model using the optimized wind field as input shows that the default Wu wind drag formula overestimates the HS during typhoon events, particularly at higher wind speeds. Westhuysen wind input, FIL wind drag formula, AB whitecapping dissipation, and Madsen bottom friction achieved the best simulation results with the RMSE HS of 0.582m. The Poisson-Gumbel compound extreme value distribution is used to calculate typhoon waves at eight characteristic points in the SCS. The optimized scheme significantly improved the different return period compared to the default SWAN scheme, particularly in severe typhoon affected areas. In the coastal waters of Guangzhou, the 100-year and 50-year return period typhoon waves were improved by 1.12m and 0.96m, respectively, providing a more rational basis for engineering design.

{"title":"Extreme design wave parameters optimization of typhoon wave for ocean engineering based on numerical simulation and observation data in the South China Sea","authors":"Dong Jiang , Bigui Huang , Qingsheng Miao , Hang Sun , Zhifeng Wang","doi":"10.1016/j.oceaneng.2025.120603","DOIUrl":"10.1016/j.oceaneng.2025.120603","url":null,"abstract":"<div><div>In this study, 20 typhoons in the South China Sea (SCS) from 2011 to 2022 are selected, based on the Weather Research and Forecasting (WRF) Grid Nudging assimilation technique, the physical parameterization schemes for hindcasting in the SCS during typhoons are Optimization. The best results for typhoon hindcasts are derived using Thompson_KF_YSU combination physical parameterization schemes. Compared to ERA5 reanalysis data, the RMSE decreased by 19.09% overall. Optimization of the physical parameterization scheme in the Simulating WAves Nearshore (SWAN) model using the optimized wind field as input shows that the default Wu wind drag formula overestimates the HS during typhoon events, particularly at higher wind speeds. Westhuysen wind input, FIL wind drag formula, AB whitecapping dissipation, and Madsen bottom friction achieved the best simulation results with the RMSE HS of 0.582m. The Poisson-Gumbel compound extreme value distribution is used to calculate typhoon waves at eight characteristic points in the SCS. The optimized scheme significantly improved the different return period compared to the default SWAN scheme, particularly in severe typhoon affected areas. In the coastal waters of Guangzhou, the 100-year and 50-year return period typhoon waves were improved by 1.12m and 0.96m, respectively, providing a more rational basis for engineering design.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"323 ","pages":"Article 120603"},"PeriodicalIF":4.6,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143369631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improved mode superposition method for hydrodynamic analysis of underwater piles under seismic excitations

IF 4.6 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2025-02-07 DOI: 10.1016/j.oceaneng.2025.120537

Po-Chen Chen, Jiunn-Shyang Chiou

Conventional mode superposition methods for seismic analysis of underwater structures are based on modal orthogonality. However, they introduce errors when dealing with hydrodynamic problems because the hydrodynamic term does not actually satisfy this property. Additionally, previous studies for hydrodynamic responses often assumed structures to be fixed on a rigid base; however, the embedded portion of piles cannot provide sufficient rigidity for the submerged portion as the rigid base does. In this study, we propose an improved method that addresses the non-orthogonality of the hydrodynamic term by incorporating the hydrodynamic force contributions from other modes. Furthermore, the method accounts for base flexibility by modeling the embedded portion of a pile as an equivalent spring matrix. Comparisons with the conventional method indicate that the hydrodynamic effects from other modes are significant under flexible base conditions or when there is pile-head mass. Moreover, parametric analyses of pile seismic responses under near-fault and far-field earthquakes reveal that base flexibility and pile-head mass significantly influence the hydrodynamic forces and associated pile response envelopes, depending on the proximity between the system's resonance frequency and the predominant frequencies of the input motions.

{"title":"Improved mode superposition method for hydrodynamic analysis of underwater piles under seismic excitations","authors":"Po-Chen Chen, Jiunn-Shyang Chiou","doi":"10.1016/j.oceaneng.2025.120537","DOIUrl":"10.1016/j.oceaneng.2025.120537","url":null,"abstract":"<div><div>Conventional mode superposition methods for seismic analysis of underwater structures are based on modal orthogonality. However, they introduce errors when dealing with hydrodynamic problems because the hydrodynamic term does not actually satisfy this property. Additionally, previous studies for hydrodynamic responses often assumed structures to be fixed on a rigid base; however, the embedded portion of piles cannot provide sufficient rigidity for the submerged portion as the rigid base does. In this study, we propose an improved method that addresses the non-orthogonality of the hydrodynamic term by incorporating the hydrodynamic force contributions from other modes. Furthermore, the method accounts for base flexibility by modeling the embedded portion of a pile as an equivalent spring matrix. Comparisons with the conventional method indicate that the hydrodynamic effects from other modes are significant under flexible base conditions or when there is pile-head mass. Moreover, parametric analyses of pile seismic responses under near-fault and far-field earthquakes reveal that base flexibility and pile-head mass significantly influence the hydrodynamic forces and associated pile response envelopes, depending on the proximity between the system's resonance frequency and the predominant frequencies of the input motions.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"323 ","pages":"Article 120537"},"PeriodicalIF":4.6,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143349929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Theoretical and experimental investigation of a two-stage X-structure vibration isolation system with inerter coupling for marine equipment

IF 4.6 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2025-02-07 DOI: 10.1016/j.oceaneng.2025.120351

Jinlin Bai, Tiangui Ye, Guoyong Jin, Yukun Chen, Wenke Li, Junjie Yuan

There is a growing concern about the use of the inerter to reduce low-frequency vibration and noise in ship and ocean engineering. The isolation performance of a traditional inerter-spring-damping vibration isolator outperforms that of a spring-damping isolator in the low-frequency range; however, it levels off at a constant value in the high-frequency range, and the resonant peak becomes large. This study proposes a novel vibration isolation system by horizontally integrating the inerter-spring-damping system into an X-structure and combining it with a two-stage vibration isolation mechanism. With the dynamic modeling, the transmissibility of the proposed vibration isolation system is derived through the frequency response function method. The acceleration, velocity inertance, and resonant frequency are theoretically analyzed by considering the influence of various structural parameters. Additionally, the effects of system parameters, including the number of layer, assembly angle, inerter ratio, and intermediate mass, on the isolation performance can improve in the low-frequency range and decline in the high-frequency range with a certain slope, and the resonant peak can be reduced, compared with the other nine types of scissor-like and vertical coupling structures. The multi-stage integrated structure can cumulatively expand the effective isolation frequency range while generating additional resonant and anti-resonance peaks. The isolation performance of the single-stage vibration system is validated using experimental prototypes and compared with the analytical method, demonstrating the correctness of the proposed theoretical model.

{"title":"Theoretical and experimental investigation of a two-stage X-structure vibration isolation system with inerter coupling for marine equipment","authors":"Jinlin Bai, Tiangui Ye, Guoyong Jin, Yukun Chen, Wenke Li, Junjie Yuan","doi":"10.1016/j.oceaneng.2025.120351","DOIUrl":"10.1016/j.oceaneng.2025.120351","url":null,"abstract":"<div><div>There is a growing concern about the use of the inerter to reduce low-frequency vibration and noise in ship and ocean engineering. The isolation performance of a traditional inerter-spring-damping vibration isolator outperforms that of a spring-damping isolator in the low-frequency range; however, it levels off at a constant value in the high-frequency range, and the resonant peak becomes large. This study proposes a novel vibration isolation system by horizontally integrating the inerter-spring-damping system into an X-structure and combining it with a two-stage vibration isolation mechanism. With the dynamic modeling, the transmissibility of the proposed vibration isolation system is derived through the frequency response function method. The acceleration, velocity inertance, and resonant frequency are theoretically analyzed by considering the influence of various structural parameters. Additionally, the effects of system parameters, including the number of layer, assembly angle, inerter ratio, and intermediate mass, on the isolation performance can improve in the low-frequency range and decline in the high-frequency range with a certain slope, and the resonant peak can be reduced, compared with the other nine types of scissor-like and vertical coupling structures. The multi-stage integrated structure can cumulatively expand the effective isolation frequency range while generating additional resonant and anti-resonance peaks. The isolation performance of the single-stage vibration system is validated using experimental prototypes and compared with the analytical method, demonstrating the correctness of the proposed theoretical model.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"323 ","pages":"Article 120351"},"PeriodicalIF":4.6,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143369632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An integrated SWOT-based interval type-2 fuzzy AHP and TOPSIS methodology for digital transformation strategy selection in maritime safety

IF 4.6 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2025-02-06 DOI: 10.1016/j.oceaneng.2025.120518

Muhammed Fatih Gulen , Esma Uflaz , Furkan Gumus , Muhittin Orhan , Ozcan Arslan

In the maritime industry, ships are inherently involved in many high-risk operations. Digital transformation has great potential to minimize risks by improving safety protocols. This study presents an integrated approach combining SWOT analysis, the Interval Type-2 Fuzzy Analytic Hierarchy Process (IT2FAHP), and the Technique for Rank Preference by Similarity to Ideal Solution (TOPSIS) to identify and prioritize digital transformation strategies (DTS) aimed at improving maritime safety. The main objective of the study is to highlighting the importance of a strategic approach to digital transformation, focusing on solutions that facilitate operational safety, support proactive risk management, and enhance traceability, auditability, and procedural compliance. The research emphasizes the importance of a strategic approach to digital transformation, the critical role of digital monitoring and recording, and the efficacy of integrating operations-oriented digital solutions. The research results, which were confirmed by sensitivity analysis, show that the integrated method works well by showing that these strategies are prioritized in different situations. This study contributes to a theoretical understanding of digital transformation in maritime safety by providing a comprehensive framework for the systematic assessment of DTS. The research outputs have provided maritime stakeholders with actionable insights and a roadmap to improve their safety protocols. Overall, it promotes a safer, more efficient maritime industry.

{"title":"An integrated SWOT-based interval type-2 fuzzy AHP and TOPSIS methodology for digital transformation strategy selection in maritime safety","authors":"Muhammed Fatih Gulen , Esma Uflaz , Furkan Gumus , Muhittin Orhan , Ozcan Arslan","doi":"10.1016/j.oceaneng.2025.120518","DOIUrl":"10.1016/j.oceaneng.2025.120518","url":null,"abstract":"<div><div>In the maritime industry, ships are inherently involved in many high-risk operations. Digital transformation has great potential to minimize risks by improving safety protocols. This study presents an integrated approach combining SWOT analysis, the Interval Type-2 Fuzzy Analytic Hierarchy Process (IT2FAHP), and the Technique for Rank Preference by Similarity to Ideal Solution (TOPSIS) to identify and prioritize digital transformation strategies (DTS) aimed at improving maritime safety. The main objective of the study is to highlighting the importance of a strategic approach to digital transformation, focusing on solutions that facilitate operational safety, support proactive risk management, and enhance traceability, auditability, and procedural compliance. The research emphasizes the importance of a strategic approach to digital transformation, the critical role of digital monitoring and recording, and the efficacy of integrating operations-oriented digital solutions. The research results, which were confirmed by sensitivity analysis, show that the integrated method works well by showing that these strategies are prioritized in different situations. This study contributes to a theoretical understanding of digital transformation in maritime safety by providing a comprehensive framework for the systematic assessment of DTS. The research outputs have provided maritime stakeholders with actionable insights and a roadmap to improve their safety protocols. Overall, it promotes a safer, more efficient maritime industry.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"323 ","pages":"Article 120518"},"PeriodicalIF":4.6,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143369620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A novel foundation design for the hybrid offshore renewable energy harvest system

IF 4.6 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2025-02-06 DOI: 10.1016/j.oceaneng.2025.120519

Yukun Ma, Liang Cui, Suby Bhattacharya

Establishing a hybrid offshore renewable energy harvest system (HOREHS) on a shared platform can reduce energy costs and increase productions. This paper aims to propose a HOREHS supported by a foundation consisting of a monopile and a plate to integrate various offshore renewable energy devices. Taking the Sheringham shoal wind farm as a case study, the benchmarking monopile dimensions were determined using design guidance and an equivalent monopile-plate combination was determined from FEM simulations. Parametric studies of system mechanical responses were conducted using FEM simulation. It is found that, to maintain the same mechanical response, the embedded depth of the monopile supporting the HOREHS should be increased by about 17% comparing with that supporting an offshore wind turbine. Adding a 14 m diameter steel plate can avoid the extra 17% embedded depth. Adding a plate has no effect on the size of influence zone of lateral soil stress. However, due to the shorter embedded depth, the magnitude of lateral stress for the hybrid foundation is larger than that for monopile, with the maximum increase being about 18%. The system response at the mudline level shows the highest sensitivity to the changes in embedded depth and plate diameter.

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